I am planning on using a large watering bowl to start and then upgrade to a kiddie pool. The place that I got my runners from had a number of kiddie pools and a pond. The runners were in and out of the kiddie pools constantly splashing and bathing. One time they were all lined up taking turns in the kiddie pool.
Hens go broody when you don’t want them to… and won’t go broody when you do.
